The bulb of the penis (urethral bulb) is the posterior expanded portion of the corpus spongiosum situated in the superfrcial interspace of the perineum proper and surrounded by the bulbo-cavernosus muscle. It is about four centimeters (one and three-quarter inches) long and one and one-half centimeters (five-eighths of an inch) wide. It conveys the bulbous part of the spongy portion of the urethra, which enters it at its deep surface and runs nearer to that surface.

Bulbus penis

Bulbe du pénis